Indomias perroteti (Boheman)

Y, R A M A M U Rt H & Ayri, Shaloo, 2010, Revision of the genus Indomias Marshall (Coleoptera, Curculionidae, Entiminae, Tanymecini) from India, Zootaxa 2357, pp. 1-49 : 40

18. Indomias perroteti (Boheman)

(figs. 7, 31, 70, 131, 132, 159, 175, 216, 217 and 218)

Brachyaspistes perroteti Boheman, 1845: 416

Sympiezomias perroteti (Boheman) Marshall, 1916: 164 ; 1941: 350 [NRS]

Description: Colour black, with yellow and white stripes on prothorax, blackish on disc, sulphur yellow below, with a broad yellow band ascending anterior and posterior margins as far as the edge of the disc, median lateral area with sparse grey vestiture, elytra with a broad yellow stripe along the extreme edge, but ceasing before the apex, a similar stripe on intervals five and six, encroaching a little on four and seven at base, and a narrower, white stripe along suture from base to declivity. Head 1.13x as long as rostrum, its upper surface convex, with very fine shallow punctations. Rostrum finely punctate, not impressed dorsally, as broad as long, its anterior margin 0.82x as broad as the posterior margin; median furrow very short, broader towards anterior margin; lateral carinae parallel and distinct running up to one third of eyes; sides narrowed towards anterior margin, where they are parallel; scrobes uniformly broad, rounded anteriorly, rectangular and parallel posteriorly towards eyes, 0.7x as long as rostrum. Eyes oval, dorsal, convex, 2x long as broad (figs. 7 and 31). Antennae reddish brown; scape gradually clavate; funicle with first and second segments equal, fourth, fifth and sixth equal; club oval, 3x as broad as funicle (fig. 70). Prothorax 1.05x as broad as long, its breadth at middle 1.1x as that of posterior margin; sides very slightly rounded and broadly constricted anteriorly; anterior margin 0.78x as broad as the posterior margin, truncate dorsally, acute laterally, posterior margin truncate; finely coriaceous above, with a faint, median stria, from the posterior margin up to a little distance away from the anterior margin. Legs with hind tibial apex without any dense, golden yellow hairs. Elytra narrowly ovate in male, broadly ovate in female, with basal margin slightly raised, humeral fold slight and not forming a prominent tubercle; apices separately and sharply mucronate in both sexes; stria deeply punctatostriate; intervals rather narrow and slightly convex, with short, white, elongate scales on the declivity, which are not erect, posterior declivity distinctly impressed, straight or slightly convex but not sinuate; elytral vestiture with predominant scales circular or subovate, reddish brown, with 11–12 ridges (fig. 131), less predominant elongate, reddish brown, with a narrow, pedicellate base, apex broadened and rectangular, inner core opaque, with 3 ridges (fig. 132).

Male genitalia: Aedeagus with median lobe having its apex rounded, length: breadth ratio 6.66:1, apophyses 0.75x as long as the median lobe, their apices clefted (figs. 216–217). Tegmen with dorsal piece 5x as broad as basal piece; parameres long, slender, their apices rounded, 0.27x as long as manubrium; manubrium slender, uniformly thick, 0.68x as long as median lobe, broadened to a subconical apex (fig. 218). Spiculum gastrale with shaft 1.12x as long as median lobe, thicker at middle, slender towards apex, with apex broad, rectangular and clefted; basal prongs equal, broad, their apices truncate (fig. 175).

Female genitalia: Spermatheca could not be described. Spiculum ventrale with shaft much slender between the base and apex, its apex blunt; basal plate spatulate, apical half conical, its apex broadly rounded, slightly longer than broad (1.16:1); ratio of length of basal plate to that of shaft 1:3.2 (fig. 159).

Length: male, 8.42–8.75 mm; female, 8.75 mm. Breadth: male, 2.80–2.85 mm; female, 3.00 mm.

Specimens examined: INDIA: Nilgirii Hills, 3 male, VI. 1962, B.V. David, on potato; 1 female, with same data as above (NPC).

Distribution: India: Tamil Nadu: Nilgirii Hills.

Taxonomic note: Marshall (1916) states that the faint median stria on the prothorax is seen from the base to beyond the middle, but it is found only at a little distance from the base and apex, almost approaching very near to apex; elytra narrowly ovate in male, broadly ovate in female.